Sparkling protein blue raspberry lemonade from Genius Gourmet is now being sold exclusively at Costco, and social media users are taking notice. What is the Costco protein sparkling water? The Genius Gourmet sparkling protein blue raspberry lemonade comes in 12-ounce cans and is sold at Costco in a pack of 15 cans. It’s a zero-sugar drink, but that doesn’t mean it has zero calories. What does the Costco protein sparkling water taste like?